IPv6 is a complete and different animal as far as subnetting goes. Please note the yellow rows as each has special common use or notes. If there is nothing in the “Amount of a /64” column that means it is to miniscule or to massive to justify calculation. Not much is the same with IPv6 compared to IPv4. Route aggregation and purpose drive subnetting is something which every enterprise IPv6 deployment will make use of, or it will fail miserably.

Subnet

Addresses

Amount of a /64

/128

1

/127

2

/126

4

/125

8

/124

16

/123

32

/122

64

/121

128

/120

256

/119

512

/118

1,024

/117

2,048

/116

4,096

/115

8,192

/114

16,384

/113

32,768

/112

65,536

/111

131,072

/110

262,144

/109

524,288

/108

1,048,576

/107

2,097,152

/106

4,194,304

/105

8,388,608

/104

16,777,216

This is equivalent to an IPv4 Internet or IPv4 /8

/103

33,554,432

/102

67,108,864

/101

134,217,728

/100

268,435,456

/99

536,870,912

/98

1,073,741,824

/97

2,147,483,648

/96

4,294,967,296

/95

8,589,934,592

/94

17,179,869,184

/93

34,359,738,368

/92

68,719,476,736

/91

137,438,953,472

/90

274,877,906,944

/89

549,755,813,888

/88

1,099,511,627,776

/87

2,199,023,255,552

1/8,388,608

/86

4,398,046,511,104

1/4,194,304

/85

8,796,093,022,208

1/2,097,152

/84

17,592,186,044,416

1/1,048,576

/83

35,184,372,088,832

1/524,288

/82

70,368,744,177,664

1/262,144

/81

140,737,488,355,328

1/131,072

/80

281,474,976,710,656

1/65,536

/79

562,949,953,421,312

1/32,768

/78

1,125,899,906,842,620

1/16,384

/77

2,251,799,813,685,240

1/8,192

/76

4,503,599,627,370,490

1/4,096

/75

9,007,199,254,740,990

1/2,048

/74

18,014,398,509,481,900

1/1,024

/73

36,028,797,018,963,900

1/512

/72

72,057,594,037,927,900

1/256

/71

144,115,188,075,855,000

1/128

/70

288,230,376,151,711,000

1/64

/69

576,460,752,303,423,000

1/32

/68

1,152,921,504,606,840,000

1/16

/67

2,305,843,009,213,690,000

1/8

/66

4,611,686,018,427,380,000

1/4

/65

9,223,372,036,854,770,000

1/2

/64

18,446,744,073,709,500,000

This is the standard end user allocation

/63

36,893,488,147,419,100,000

2

/62

73,786,976,294,838,200,000

4

/61

147,573,952,589,676,000,000

8

/60

295,147,905,179,352,000,000

16

/59

590,295,810,358,705,000,000

32

/58

1,180,591,620,717,410,000,000

64

/57

2,361,183,241,434,820,000,000

128

/56

4,722,366,482,869,640,000,000

256

/55

9,444,732,965,739,290,000,000

512

/54

18,889,465,931,478,500,000,000

1,024

/53

37,778,931,862,957,100,000,000

2,048

/52

75,557,863,725,914,300,000,000

4,096

/51

151,115,727,451,828,000,000,000

8,192

/50

302,231,454,903,657,000,000,000

16,384

/49

604,462,909,807,314,000,000,000

32,768

/48

1,208,925,819,614,620,000,000,000

65,536 This is the standard business allocation

/47

2,417,851,639,229,250,000,000,000

131,072

/46

4,835,703,278,458,510,000,000,000

262,144

/45

9,671,406,556,917,030,000,000,000

524,288

/44

19,342,813,113,834,000,000,000,000

1,048,576

/43

38,685,626,227,668,100,000,000,000

2,097,152

/42

77,371,252,455,336,200,000,000,000

4,194,304

/41

154,742,504,910,672,000,000,000,000

8,388,608

/40

309,485,009,821,345,000,000,000,000

16,777,216

/39

618,970,019,642,690,000,000,000,000

33,554,432

/38

1,237,940,039,285,380,000,000,000,000

67,108,864

/37

2,475,880,078,570,760,000,000,000,000

134,217,728

/36

4,951,760,157,141,520,000,000,000,000

268,435,456

/35

9,903,520,314,283,040,000,000,000,000

536,870,912

/34

19,807,040,628,566,000,000,000,000,000

1,073,741,824

/33

39,614,081,257,132,100,000,000,000,000

2,147,483,648

/32

79,228,162,514,264,300,000,000,000,000

4,294,967,296 This is the standard ISP Allocation

/31

158,456,325,028,528,000,000,000,000,000

8,589,934,592

/30

316,912,650,057,057,000,000,000,000,000

17,179,869,184

/29

633,825,300,114,114,000,000,000,000,000

34,359,738,368

/28

1,267,650,600,228,220,000,000,000,000,000

68,719,476,736

/27

2,535,301,200,456,450,000,000,000,000,000

/26

5,070,602,400,912,910,000,000,000,000,000

/25

10,141,204,801,825,800,000,000,000,000,000

/24

20,282,409,603,651,600,000,000,000,000,000

/23

40,564,819,207,303,300,000,000,000,000,000

/22

81,129,638,414,606,600,000,000,000,000,000

/21

162,259,276,829,213,000,000,000,000,000,000

/20

324,518,553,658,426,000,000,000,000,000,000

/19

649,037,107,316,853,000,000,000,000,000,000

/18

1,298,074,214,633,700,000,000,000,000,000,000

/17

2,596,148,429,267,410,000,000,000,000,000,000

/16

5,192,296,858,534,820,000,000,000,000,000,000

/15

10,384,593,717,069,600,000,000,000,000,000,000

/14

20,769,187,434,139,300,000,000,000,000,000,000

/13

41,538,374,868,278,600,000,000,000,000,000,000

/12

83,076,749,736,557,200,000,000,000,000,000,000

/11

166,153,499,473,114,000,000,000,000,000,000,000

/10

332,306,998,946,228,000,000,000,000,000,000,000

/9

664,613,997,892,457,000,000,000,000,000,000,000

/8

1,329,227,995,784,910,000,000,000,000,000,000,000

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